JP2001206135A - Safety device of bulk lorry - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safety device not applying quick service even if a door of a valve instrument box is opened during the traveling of a bulk lorry. SOLUTION: In the safety device of the bulk lorry having a door detector 11 for detecting the opened door of the valve instrument box 2 and applying brake when the door is opened, an alarm 23 for notifying the ON state of the door detector 11 is installed in a cab, a brake detector 12 for detecting the operation of a parking brake is connected in series to the door detector, and brake is applied to the whole wheels when the brake detector 11 and the door detector 12 both are ON.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for a tank lorry (referred to as a bulk lorry) for transporting LP gas, and more particularly, to preventing a bulk lorry from erroneously starting when a door of a valve instrument box is opened. Related to safety devices.

[0002]

2. Description of the Related Art As shown in FIG. 3, a bulk lorry has an LP gas tank 1 mounted on a chassis of a traveling vehicle 4 and an L gas tank at a base.
A transport vehicle for charging P gas and supplying it to an LP gas storage tank installed at a customer, and a liquid feed pump driven by power from a PTO (power take-off) of an engine of a traveling vehicle for supplying LP gas. And a supply hose 3 connected to the LP gas storage tank. In addition, various safety devices are provided to ensure safety in transport and supply of LP gas. Since the engine of the traveling vehicle is not stopped during the supply of the LP gas, the supply hose 3 is not stored when the supply of the LP gas is completed and the bulk lorry is started, not to mention during the supply of the LP gas,
When the door of the valve instrument box 2 is open, the brakes are applied to all wheels of the vehicle so as to prevent accidental departure.

In this configuration, a door detector for detecting the opening and closing of a door is generally provided on a door of a valve instrument box 2 of a bulk lorry, and when the door is opened, an air brake valve is opened and a vehicle is opened. All wheels are braked.

[0004]

The opening and closing of the door of the valve instrument box is performed by manually engaging and disengaging the lock mechanism by a specific person, so that the door is not accidentally opened and the door is closed. Makes sure that the door is securely closed.

[0005] However, during travel of the bulk lorry,
If the lock mechanism is incompletely locked and the lock mechanism comes off due to vibration of the vehicle, etc., it is detected that the door of the valve instrument box has been opened (the door detector turns on), and all the wheels of the vehicle are detected. Will be braked. This sudden braking is very dangerous because the driver does not expect it.

SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to provide a safety device which does not suddenly apply a brake when a door of a valve instrument box is opened during traveling of a bulk lorry. .

[0007]

In order to achieve the above object, the present invention employs the following means. That is, in a bulk lorry safety device including a door detector for detecting that a door of a valve instrument box is open, and operating a brake on all wheels when the door is open, the door detector is turned on.
In the case of, an alarm is provided in the driver's cab, and a brake detector for detecting that the parking brake is operated is connected in series with the door detector, and both the brake detector and the door detector are turned on. In this case, the brakes are applied to all the wheels at the time of (1).

The bulk lorry safety device according to the present invention comprises an LP
A valve to prevent departure with the door of the valve instrument box of a bulk lorry equipped with a liquid feed pump driven by an engine to supply gas open. This also ensures safety when this is opened during running.

The type of the door detector for detecting that the door of the valve instrument box is open is not particularly limited, but it is convenient to use a limit switch. The brake detector may be provided so as to be engaged with the operation lever of the parking brake. The notifying device for notifying when the door detector is ON is a simple indicator lamp that lights when the detector is ON, but may be an alarm device for issuing an alarm. However, if an alarm is used, it is necessary to provide a switch or the like so that the alarm does not operate when the door of the valve instrument box is opened for supply work or the like.

[0010] When both the brake detector and the door detector are ON, the brakes are operated on all the wheels by operating a conventionally used brake valve (magnetic valve) with an electromagnetic relay. .

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a safety device for a bulk lorry according to the present invention will be described below with reference to the drawings. As shown in FIG. 2, the door 2a of the valve instrument box 2 of the bulk lorry has
A door detector 11 that is turned ON when the door 2a is opened is provided. The parking brake lever in the cab is provided with a brake detector 12 which is turned on when the parking brake is applied.

Here, a limit switch is used for the door detector 11, and a switch is used for the brake detector 12. The door detector 11 is connected to an electromagnetic relay 14, and the brake detector 12 is connected to a coil of the electromagnetic relay 14. That is, when the brake detector 12 is turned on, the coil is excited and the electromagnetic relay 14 is turned on. Further, the electromagnetic relay 14 is connected to the coil of the electromagnetic relay 15, and the electromagnetic relay 15 is turned on when the door detector 11 and the brake detector 12 are on.

The electromagnetic relay 15 is connected to a switching valve 16 (magnetic valve) provided in a pneumatic brake circuit for operating an air brake. Reference numeral 18 denotes an air tank, and reference numeral 17 denotes a three-way valve that branches and sends air to both an air booster and a brake valve. Also, 20 and 21 are indicator lights provided on the driver's cab, the indicator light 20 is turned on when the brake detector 12 provided on the parking brake is ON, and the indicator light 21 is provided on the door detector 11 and the brake detector 12. Are both O
Lights when N, that is, when all wheels are braked. 23 is a door detector 11 of the valve instrument box 2
Is an annunciator for informing when is ON, in which a pilot lamp is used.

With this configuration, when the door 2a of the valve instrument box 2 is closed, the door detector 11 is turned off.
The parking brake is pulled and the brake detector 1
Even when 2 is turned on, the coil of the electromagnetic relay 15 is not energized and is in the off state, and the switching valve 16 is not operated.

When the parking brake is not applied, the electromagnetic relay 15 does not operate even if the door 2a of the valve instrument box 2 is opened. The electromagnetic relay 15 operates only when the parking brake is applied and the door 2a of the valve instrument box 2 is opened.

In the operation of supplying LP gas to the bulk storage tank, the operation is always performed with the parking brake being applied.
When the door 2a of the valve instrument box 2 is opened without permission, all the wheels of the bulk lorry are braked. At this time, the indicator light 21 of the driver's cab is turned on to indicate that all the wheels are braked. Therefore, when the supply operation of the LP gas is completed and the bulk lorry is to be started, the indicator lamp 21 is viewed before the parking brake is released, and when this is lit, the door 2a of the valve instrument box 2 is opened. Since it is understood that there is, forgetting to close the door 2a of the valve instrument box 2 can be prevented. Also, in the event that the bulk lorry is running, the door 2 of the valve
When a opens, the brakes to all the wheels do not operate,
Since the indicator light 23 is turned on, the driver can see this, stop at an appropriate place, and close the door 2a of the valve instrument box.

[0017]

As described above, the safety device for a bulk lorry according to the present invention is provided with an alarm for notifying when the door detector is ON in the driver's cab and for detecting that the parking brake is being operated. The brake detector and the door detector are both connected in series with the door detector.
Since the brakes were activated for all wheels at N, the brake detector is ON during the supply of LP gas, and when the valve instrument box is opened, the brakes are applied to all the wheels and the If the door of the valve instrument box is opened during traveling, the alarm is activated and the brake is not activated, so that safety during traveling is ensured.

[Brief description of the drawings]

FIG. 1 is a plan view illustrating a configuration of a bulk lorry safety device as one embodiment of the present invention.

FIG. 2 is a plan view showing a mounting state of a door detector of a valve instrument box of a bulk lorry.

FIG. 3 is a side view showing the entire bulk truck.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... LP gas tank 2 ... Valve instrument box 2a ... Door 3 ... Hose reel box 4 ... Operation room 11 ... Door detector 12 ... Brake detector 14 ... Electromagnetic relay 15 ... Electromagnetic relay 16 ... Switching valve 17 ... Three-way valve 18 ... Air tank 20, 21 ... indicator light 23 ... alarm

Claims (1)

[Claims] 1. A bulk lorry safety device comprising a door detector for detecting that a door of a valve instrument box is open, and activating brakes on all wheels when the door is open. A warning device is provided in the cab for notifying when the vehicle is ON, and a brake detector for detecting that the parking brake is being operated is connected in series with the door detector, and both the brake detector and the door detector are provided. A safety device for a bulk lorry, wherein brakes are applied to all the wheels when is ON.